What year did Britain's Royal Flying Corps choose watches made by the company who later made the Electroquartz as their official timekeepers?
1917
-1
Section::::Abstract.
Omega Electroquartz
43588283
-1
Section::::Abstract.
Omega Electroquartz
43588283
-1
Section::::Abstract.
Omega SA
861366
-1
Section::::Abstract.
Omega SA
861366